40721028 has 24 divisors (see below), whose sum is σ = 100017120. Its totient is φ = 12859200.

The previous prime is 40721027. The next prime is 40721029. The reversal of 40721028 is 82012704.

It is an interprime number because it is at equal distance from previous prime (40721027) and next prime (40721029).

It is a junction number, because it is equal to n+sod(n) for n = 40720989 and 40721007.

It is not an unprimeable number, because it can be changed into a prime (40721027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 89073 + ... + 89528.

It is an arithmetic number, because the mean of its divisors is an integer number (4167380).

Almost surely, 2^40721028 is an apocalyptic number.

It is an amenable number.

40721028 is an abundant number, since it is smaller than the sum of its proper divisors (59296092).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40721028 is a wasteful number, since it uses less digits than its factorization.

40721028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178627 (or 178625 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 40721028 is about 6381.3030017388. The cubic root of 40721028 is about 344.0378654010.

The spelling of 40721028 in words is "forty million, seven hundred twenty-one thousand, twenty-eight".